Serious question here. Did the studies those statistics come from only include households with legally owned guns?

I couldn't tell you without digging into more weeds than I care to at the moment. I'd kick that one back over to you.

What I can do is wildly speculate that A) people who own guns illegally are probably going to be less than likely to self-report to having a gun in the house than people who own guns legally, so if the statistics are skewed by illegal gun ownership then they're probably skewed more in favor of owning a gun, meaning this isn't going to help the gun-owners any, and B) if there were studies that controlled for legal/illegal gun* ownership that showed a net safety benefit for legal gun owners, we'd all have heard about it.

*Gun in this paragraph refers to handgun; as far as I know, there's no evidence that long guns present a statistically significant health risk.
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